Trimming-cutter for sewing-machines.



J.M. MERROW. TBIMMING CUTTER FOR SEWING MACHINES.

ARPLIOATIQN FILED 1320.9,1905,

907,618. Patented Dec. 22,1908.

WI-messesa/ INVENTEIR o' I J W BY W . TTUENEYE- UNITED STATES PATENTOFFICE.

JOSEPH M. MERROW, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE MERROWMACHINE COMPANY, OF HARTFORD, CONNECTICUT,

A CORPORATION OF CONNECTICUT.

TRIMMING-CUTTER FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Dec. 22. 1908.

Application filed December 9, 1905. Serial No. 291,131.

To all whom it may concern:

Be it known that I, JOSEPH M. MERRow, a citizen of the United States,and a resident of the city and county of Hartford, State of Connecticut,have invented certain new and useful Improvements in Trimming-Cuttersfor Sewing-Machines and I do hereby declare the following to be a full,clear, and exact description of the same, reference being had to theaccompanying drawings, forming a part of this specification, and to theletters and figures of reference marked thereon.

The cutter of the present invention is primarily designed for thetrimming mechanism of sewing machines, the object being to provide animproved form of double ended, reversible cutter which may be sharpenedat either end without changing the form of the suns.

In the accompanying drawings: Figure 1 is a side elevation of thecutter, mounted in a holder and shows also a portion of a carrier and ofa companion cutter. Fig. 2 is a front elevation of the cutter and itsholder showing also a portion of acompanion cutter. Fig. 8. is a frontelevation of the cutter. Fig. 4 is a view of the cutter as seen from theleft of Fig. 3. Fig. 5 is a view of the cutter as seen from the right ofFig. 3. Fig. 6 is a cross sectional view taken on the line 66 of Fig. 3.

Throughout the several figures of the drawings, like reference figuresand letters indicate the same parts.

The letter A denotes the cutter, B the holder, C the clamp, D thecarrier and E the com anion cutter.

T e cutter is preferably made from a bar of steel, rectangular in crosssection and cut away or recessed on one of its faces from diametricallyopposite corners to a point near the middle of its length to produce thetwo flanges a a, the end faces of which form the guides for the cuttersas will be hereinafter explained. The efiect of such cutting away orrecessing is to produce a third flange a extending along the sides ofthe bar parallel and coincident with its opposite edges for a distancefrom each end and crossing from one side or edge to the other aboutmidway of the length of the bar as at c The flange a furnishes twocutting edges arranged in o posite directions one at each end as at a ana The flanges a a and a. form approximately a right angle in crosssection and both are cut across in a single plane at each end the planesof the faces of the two ends preferably being parallel.

The cutter can thus be sharpened at both ends by grinding the end facesentirely across both flanges in a single plane without changing the formof the ends and each of the said faces will have a cutting edge and aguide. The ends are preferably cut square with relation to one face ofthe bar as shown in Figs. 1, 4 and 5 and at such an angle with one ofthe adjacent faces of the said bar as to produce an acute cutting edgeon the flange at the side adjacent to the recess at each end as shown inFigs. 2 and 3.

. The cutter is preferably secured in its holder by the clamp C andscrew C and the holder B may be held in a carrier D which is adapted tobe reciprocated by any convenient and suitable known means.

In operation, the cutter A is intended to cooperate with a companioncutter E, and the face of the flange forming the guard is designed to bealways in contact with the side of the companion cutter E to prevent thecutting edges of the two cutters from undue conflict, as is common intrimming mechanism and shown in Figs. 1 and 2. It will be understoodthat the plane of the face of the acting end of the cutter A should besubstantially in the plane of the side of the companion cutter E andthat the path of movement of the cutter A should be practically parallelto the same plane.

Under the above conditions, the cutter A when worn or dull at one end,may be reversed or turned end for end in its holder and used again.

The improved cutter is well adapted for use in sewing machines fortrimming off the edges of the material.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. As a new article of manufacture, a trimming cutter formed with aflange at one side extending parallel and coincident with one edge atone end and parallel and coincident with the opposite edge at the otherend and extending across from one edge to the other at a pointintermediate the two ends, whereby a cutting edge and a guard for thesame are provided at each end of the cutter; substantially as described.

2. A trimming cutter of bar form ground or dressed at its two ends insubstantially parallel lanes at an acute angle to the major axis of t ebar, each plane inc uding a cutting edge and a guide therefor, and thesaid cutter being reversible that either of its cutting edges may beutilized; substantially as described.

8. A trimming knife of bar form, each of the end portions of which aresubstantially I right angular in cross section to provide a 10 cutterand a guide therefor at each end, said right angular portions of the barat 0 posite ends being inverted relatively to eac other and the endfaces being ground or made each, in a single plane to include both thecutting edge and the guide; substantially as 15 shown and described.

JOSEPH M. MERROW'. Witnesses:

ALoNzo M. LUTHER, i W. O. W. STEWART.

